Silver-Copper Oxide Based Reactive Air Braze (RAB) for Joining Yttria-Stabilized Zirconia

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Journal of Materials Research, 20(3):636-643

OSTI ID:15020584

Kim, Jin Yong Y; Hardy, John S; Weil, K Scott

We are investigating a new method of ceramic-to-metal joining, referred to as reactive air brazing (RAB), as a potential method of sealing ceramic components in high-temperature electrochemical devices. Sessile drop wetting experiments and joint strength testing were conducted using yttria stabilized zirconia (YSZ) substrates and CuO-Ag based air brazes. Results from our studies indicate that the wettability of the braze improves substantially with increasing CuO content, over a compositional range of 1 - 8 mol% CuO, which is accompanied by an increase in the bend strength of the corresponding brazed YSZ joint. The addition of a small amount of TiO2 (0.5 mol%) to the CuO-Ag braze further improves wettability due to the formation of a titanium zirconate reaction product along the braze/substrate interface. However, with one notable exception, the bend strength of these ternary braze joints remained nearly identical to those measured in comparable binary braze joints. SEM analysis conducted on the corresponding fracture surfaces indicated that in the binary braze joints the failure occurs primarily at the braze/YSZ interface. Similarly in the case of the the ternary, TiO2-doped brazes joint failure occurs predominantly along the interface between the braze filler metal and the underlying titanium zirconate reaction layer.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 15020584
• Report Number(s): PNNL-SA-42714; AA2530000
• Journal Information: Journal of Materials Research, 20(3):636-643, Journal Name: Journal of Materials Research, 20(3):636-643 Journal Issue: 3 Vol. 20
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BRAZING
CERAMICS
COPPER OXIDES
FILLER METALS
MATERIALS TESTING
SILVER
TITANIUM OXIDES
WETTABILITY
YSZ
braze
wetting
mechanical properties
YTTRIUM OXIDES
ZIRCONIUM OXIDES